摘要
采用大涡模拟（LES）方法,并结合动力学亚格子尺度应力（SGS）模型,通过数值求解柱坐标系下的滤波Navier-Stokes方程,研究了绕管轴旋转圆管内的湍流流动特性.为验证计算的可靠性,以及动力学SGS模型对于旋转湍流的适用性,将大涡模拟计算所得的结果,与相应的直接模拟（DNS）结果和实验数据进行了对比验证,吻合良好.进一步对旋转圆管湍流的物理机理进行了探讨,研究了湍流特性随旋转速率的变化规律.当旋转速率增加时,湍流流动有层流化的发展趋势.基于湍动能变化的关系,分析了旋转效应对湍流脉动生成的抑制作用.
Turbulent flow in a circular pipe rotating around its axis is numerically investigated by using large eddy simulation (LES) approach coupled with a dynamic subgrid-scale (SGS) model. To validate the present calculation and verify the performance of dynamic SGS model in the LES of rotating turbulence, the present LES results are compared with some available direct numerical simulation (DNS) data, which proves to agree well with each other. Then turbulent rotating pipe flow behaviors are investigated. The tendency of re-laminarization is detected at higher rotation angular speed. The reduction of turbulence production with increasing rotation speeds is examined based on the budgets of the turbulent energy.
出处
《力学学报》
EI
CSCD
北大核心
2002年第6期833-846,共14页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金(59776011)
中国科学院"百人计划"
教育部"跨世纪优秀人才培养计划"资助项目。
关键词
旋转圆管
湍流
大涡模拟
亚格子尺度应力模型
数值模拟
large eddy simulation (LES), subgrid scale (SGS) model, turbulent rotating pipe flow
